Brake-block or the like.



H. PROUD. BRAKE BLOCK OR THE LIKE. APPLICATION FILED APR. 1a, 1914.

y1,102,215. Patented June 30,1914.

'UNITED s'rATEs 'PATENT onirica HERBERT moon, or BUxfroN, :'ENGLAND.

BnAKnBLocx on THEiLrKE.,

Specification of Letters Patent.

Patented Ju ne 80, 1914.

`original application med september 4'; 1513, serial Nt'. ra-13s. Divided a'na this appncano'n ined Aprn 18,1914. semina. 833,002.

ifo all 'reliant 'it muy concern subject ofthe King of Great Britain and Ireland, -and a resident of Buxton, in the county of Derby, England; have invented certain new andl useful Improvements in,y

Brake-Blocks or the like7 of which the fol lowing 1s a specification.

*With lorakeblocks, brake bands, flat or :icone shapcd'friction clutch rings, 'or the like made of a thick'woven fabric similar .to driving belts and impregnated with hard cementitious matcnal 1t is found that considerable and quickly repeated adjustment is necessary for sometime after the band, block7 ring' orthe like is first put in place and put towork. I have found that the necessity for making such adjustment arises, not from the wearing.,lr a *ay of the fabric, but from its diminution in thickness resulting from the working pressure put upon it, Whichdiminution progressively continues, until the fabric has beengreduccd tothe least thickness it is capable ofifeiiig reduced to un 25. iler such pressure. l/Vhenthis state is arrived u'at the fabric composing the band or the like is only further reducedin thickness as a result of the frictional wear and attrition lto' which it is subjected, and as the wear is very small very little adjustment is required after the fabric can no longer be re- ;lueed in thickness by the working pressure put upon it.

lhisaiiplication constitutes a divisional application ofy application Serial No. 788,458, filed September Ll, ,19.13, upon which Letters latcnt No. '1,096,705 were granted May 12, 19t-l.

lt has been suggested to subject such blforks, bands, rings or the like, or the strips from which they are cut, and before they are put in use, to a heavy pressure to consolidate them or render them more compact. But such pressure unless exerted under conditions which restrain the lateral and longitudinal flow of the fabric results not only in" a reduction of thickness of the fabric but also in a lateal and longitmli'ial flow 'hr extension of the fabric, so that the fabric 5b 'after being pressed is longer and wider than n L g Widening the .fabric results in and from f'Be 1t kno-wn that I. Hnnnnn'r linoon, a

a stretching,r of the yarns from which the faric is `woven,.and a detcrioation of the strength such yarns as a conscipicnce of tlie stretching thus given to them.

'lt'h'e object of my invention is to consolidate and render more compact such afahric y brake block or the like (hereinafter referred to as a brake block) by rediuring it, by pressure', before it is put in use. to a thickness beyond which it cannot be further reduced merely by the pressure to which it is subjected under working conditims, and in carrying my invention into veffect I subject my brake block to the desired pressure in suc'h a manner and underlsuch conditions that although it is reduced to the desired thickness it is not increased either in width or in length, and the yarns of which 'it is composed are therefore not stretched and are not deteriorated in strength and structure as a result of stretching. This is acpomplished by placing the impregnated lengt of fabric' which is to compose the ultima Vc brake block in a die which closely surrounds ythe edges of the fabric and prevents it from flowingl or stretching either longitudinally or laterally when pressure is applied to its face by a ram o r the like and it is thereby reduced in thickness to the desired extent.

The condition obtaining in my improved woven and pressed fabric block is that its constituent yarns are compressed and are unstretehedwhereas in prior construct-ions the constituent yarns although compressed are also stretched. The described di.I pressure is preferably exerted upon thc'hrake block while it is in the curved form which it willl bccupy when in use. The block should be warmed to soften the hard cementitious material contained within it, and the pressure be applied while the cementitious material is soft and comparatively non -re sistant.

'lhe mfconnianying drawings illustrate a die used tor pressing a brake block to the condition described and also illustrate`a block which has been so pressed.

Figure l is a plan View of a die in which a brake block is pressed as described and in the curved form in which it will be used.

loo

Fig. 2 shows such die in section and also the contained block with the ram by means of which the latter is pressed. Figs. 3 and 4 are cross sectional views of such block Ice-v iore and after pressing.

A represents the die with a recessa'cut in its face which recess is justof the dimensions of the edge of the blockl which is to be pressed. The block B is yclit to the external edge dimensions of the recess a und is held in the die and bent to itsvcuive and so as to lie at, the bottom thereof while Warm.

C is the-ram which also fits the die and is pressed down to reduce the block in thickness. The Walls of the die prevent the block B lengthening or widening.. Figs. 3 and 4 show7 in' cross section a fabric brake block B. In Fig. 3 before pressing, it is shown as two inches Wide and es three-quarters of an inch thick. In Fig. 4, after die pressing, l

monete it is Shawnee-nin two inches transmettenfsbriccompressed in one direction yto substantially 4the 'Working pressre upon the block, While retaining its original dimensions in other directions, and a. herd 4cementitious substance incorporated therewith, whereby the .tbrous constituents of the block are retained in compressed and unstretched condition, and disintegration thereof is prevented... v

In Witness whereof l have hereunto set my hand in the presence of two subscribing witnesses.

v HERBERT FROD.

Witnesses:

nem/AM Geo. Hers, .Jenn 0. -Coswnnn 

